Core.



M. H. FLETCHER.

GORE.

APPLICATION FILED MAY 21, 1912.

Patented Sept. 17, 1912.

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tinrrnn srarns manna orrron.

' MORDEGAI H. FLETCHER, 311 GINCINNATI, OHIO.

CORTJ.

To all whom it may concern Be it known that I, Monnnoar H.

'FLETGHER, a citizen of the United States,

residing at Cincinnati, in the county of Hamilton and State of Ohio,have invented Letters Patent #820858, issued to me Mayj In my presentinvention, instead of ordinary paper of one or more layers, with or.without perforations, and with or WlillOllt;

a waterproof outer layer or coating, 1 use embossed paper of any of thecheap qualities readily procurable in the market. It will be understoodthat there must be a sutl cient thickness of the combustible paper toenable the core bar to be withdrawn after the pipe has been cast and thepaper burned by the heat of the metal. The required thickness ,in thesmaller pipe is usually about i; of an inch, and embossed paper, whenwrapped upon the core bar, facilitates ventilation in carrying oft gasesfrom the burning paper, and at the same time accomplishes a greateconomy in the saving of the amount of paper used, to the extent of thevoids provided by the embossing.- Ordinarily, the paper is wrappedspirally upon the bar, each layer lapping over the preceding layer -1-its width, its width, or i its width, according to the number ofthicknesses required to provi e the requisite thickness of thecombustiblle layer, for the particular pipe to be least. he embossedpaper is better thanifiat paper as it lies on the core barrel. smootherand adapts itself better to the uneven surface formed by the edge of thepreceding layer or layers and the core barrel.

By embossed paper, as the term is here used, is meant a paper or sheetof combustihle material, pressed in parts out of a continuous planesurface, forming preferably a more or less regular pattern so that-jt're- Specification of Letters Patent.

Patented Sept. 1?, 1912,

Application filed May 21. 1912. Serial No. 69839? quent air spaces areleftadjacent to the core surface. L

The drawings attached hereto show how the core is built up for use'incasting cylin- 5'0 drical pipes, and

Figure 1 is an exterior View of a veilted metal core barrel, wountlspirally with a strip of combustible material in sheet form, with partof the wound portion partially as coated with a finishing layer of loamand mud. Fig. 2 is a transverse cross section of a completed core. F ig.3 is aplan View of a piece of the embossed paper used for thecombustible layer; and Fig. 4 is a'spiral sec- 79 tion of the core andlongitudinal section or the paper showing the air spaces.

Referring now to the drawings, 0 designates a metal core barrel ventedby suitable drilled or other holes, 1; to permit' the escape 75 cl gasesformed by heating the earthy layer and the burning of the layer ofcombustible material, etc.

G. P. designates the core barrel when wound with the embossed paperstrip, P, so in Fig. 1, shown as applied spirally, each succeeding layeroverlapping the one preceding it. The combustible layer so built up ofthe paper P gives a sufficient thickness to permit the core bar C to bewithas drawn after the pipe has been cast. The paper P is embossed,portions of its surfaces, 7), being pressed outward from the plane ofthe main surfaceso as to form a secondary plane. This embossingernaly,be soof any style or pattern desired. Upon the combustible layer isformed a noncombustible lavur L: of mud and loam, or other suit-ablevmaterial. This is ordinarily: bated with 'l'iiackening, and when thecore is ri ed, 95 it is inserted in the flask and th molten. metalpoured around the core in t e flask. The embossed paper may be made ofany materials or composition of matter found convenient, or that willproduce a paper at 10o an acceptable price. The ordinary carpet paper soembossed has been found to give satisfactory results. A combustiblepaper strip be wound on by hand or in any other convenient way, and maybe held in ice place by adhesive material, or, preferably, by tying withthincord or soft wire. All superfluous or overhanging portions maytrimmed away at each end of the core bar. The loam and mud, or finishinglayer, may llu be turned upon the bar in the usual way after it iswrapped with the combustible layer. After the metal has been poured, thecombustion of the layer of paper, while complete because of the intenseheat of the molten metal surrounding the .core, is slow enough to allowthe loam or finishing layer to retain its proper form until the metalsets? The venting will be complete and perfect through the agency of theembossed paper and the vents 'v of the core barrel.

This invention secures smooth and uniform castings at a less cost thanwith other methods, and further reduces the percentage of failures orcastings which must be rejected because of imperfections.

While I have referred in the foregoing description to paper as thematerial used as the wrapping for the core barrel, I intend that thisterm shall include any embossed combustible material in sheet form and,therefore, I do not limit the material used "to paper alone. p

I claim as my invention and deslre to secure by Letters Patent of theUnited States like, consisting of a metal core barrel, hav

mg one or more layers of embossed comone or/more non-combustible outerlayers.

3. An improved core for casting pipes,

consisting of a met-a1 core barrel wrapped in a spiral direction with arelatively wide and thin strip of embossed combustible material; and oneor more non-combustible outer layers.

4. An improved core for casting pipes, consisting of a metal core barrelwrapped in a spiral direction with a relatively wide and thin stripof'embossed combustible ma terial, said layers so applied as to overlapone or more preceding layers; and one or more non-combustible outerlayers.

5. A core for casting hollow pipes and the like, consisting of a metalcore barrel wrapped with embossed paper in sheet form,

and one or more non-combustible outer layers. I

6. A core for casting hollow pipes and the like, consisting of a metalcore barrel provided wit-h vents and wrapped with embossed paper insheet form, and one or more non-combustible outer layers.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit- MORDEGAI H. FLETCHER. WVitnesses IVALTER A. KNIGHT,ALICE L. TILDESLEY.

'IIBSSBS.

